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In acidic medium, FeSO4 is oxidised to Fe³+ by KMnO4. If 250 mL of a FeSO4 solution reacts completely with 32 mL of 5 M KMnO4, what is the molarity of the FeSO4 solution?
- 3.2 M
- 1 M
- 4/3 M
- 2/3 M
Correct answer: 3.2 M
Solution
KMnO4 gains 5 electrons per formula unit (Mn: +7 to +2) while FeSO4 loses 1 electron (Fe: +2 to +3). Setting milliequivalents equal: 5 * 5 * 32 = 1 * M * 250, giving M = 800/250 = 3.2 M.
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